.return-to-top-btn{position:fixed;inset-inline-end:2.5rem;z-index:50;display:flex;align-items:center;justify-content:center;width:3.5rem;height:3.5rem;border-radius:50%;background:#063e27;border:none;box-shadow:0 10px 25px rgba(6,62,39,.3),0 4px 10px rgba(0,0,0,.1);color:#ffffff;cursor:pointer;transition:all .4s cubic-bezier(.34,1.56,.64,1);outline:none;overflow:visible;padding:0;right:20px;bottom:80px}.return-to-top-btn:before{content:"";position:absolute;inset:-4px;border-radius:50%;background:linear-gradient(135deg,#063e27,#0a5c3a);opacity:0;transition:opacity .3s ease;z-index:-1}.return-to-top-btn:hover{transform:translateY(-8px) scale(1.05);box-shadow:0 15px 35px rgba(6,62,39,.4),0 6px 15px rgba(0,0,0,.15)}.return-to-top-btn:hover:before{opacity:1}.return-to-top-btn:active{transform:translateY(-2px) scale(.95)}.icon-wrapper{position:absolute;z-index:2;transition:transform .3s ease}.return-to-top-btn:hover .icon-wrapper{animation:bounceUp 1.5s infinite}@keyframes bounceUp{0%,to{transform:translateY(0)}50%{transform:translateY(-4px)}}.progress-ring{transform:rotate(-90deg);pointer-events:none;position:absolute;inset:0}.progress-ring__circle{transition:stroke-dashoffset .1s linear;filter:drop-shadow(0 0 2px rgba(255,255,255,.5))}.return-to-top-btn.visible{opacity:1;visibility:visible;transform:scale(1)}.return-to-top-btn.hidden{opacity:0;visibility:hidden;transform:scale(0);pointer-events:none}.dark .return-to-top-btn{background:#084d31}@media (max-width:640px){.return-to-top-btn{bottom:2rem;inset-inline-end:2rem;width:3rem;height:3rem}.progress-ring{width:48px;height:48px}}